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Conference on Lasers and Electro-Optics

Single sideband data retrieval using swept-carrier optical memory

T. Wang, Haifeng Lin, THOMAS W. MOSSBERG

Published Jun 2, 1996• 0 citations
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Abstract

Summary form only given. The swept-carrier optical data storage technique provides high storage density together with high read-write speed. In this technique, data is temporally encoded on a frequency-swept optical data beam. This beam along with a cotemporal, frequency-swept, reference beam illuminate a storage material and act to record the temporal structure of the data beam. We point out here that by eliminating the frequency offset between swept-carrier data and reference beams, one records only a single sideband of the data beam and on reconstruction can generate a single-sideband signal beam containing essentially the same modulation information as the original dual-sideband data beam. This result may be useful in both memory storage applications where it may lead to higher spectral storage densities and in communications as a means of generating single-sideband optical beams, albeit with an intrinsic frequency chirp.

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Summary form only given. The swept-carrier optical data storage technique provides high storage density together with high read-write speed. In this technique, data is temporally encoded on a frequency-swept optical data beam. This beam along with a cotemporal, frequency-swept, reference beam illuminate a storage material and act to record the temporal structure of the data beam. We point out here that by eliminating the frequency offset between swept-carrier data and reference beams, one records only a single sideband of the data beam and on reconstruction can generate a single-sideband signal beam containing essentially the same modulation information as the original dual-sideband data beam. This result may be useful in both memory storage applications where it may lead to higher spectral storage densities and in communications as a means of generating single-sideband optical beams, albeit with an intrinsic frequency chirp.
Spectral holography provides for the storage of data-encoded, time-domain optical signals in frequency-selective recording materials. This capability may form the basis for entirely new classes of ultrahigh-speed and -density optical storage devices. We demonstrate the implementation of swept-carrier spectral-holographic data storage in a single-sideband mode. Temporal-waveform information originally encoded in doublesideband format is re-created but stripped of one of its sidebands. The process described can be used to achieve higher spectral storage densities or as an optical single-sideband conversion device.
A new time-domain approach to frequency-selective optical data storage is described. In this approach, a spatial storage cell is exposed to two cotemporal, spatially angled, frequency-chirped excitation fields whose duration can greatly exceed the homogeneous dephasing time of the storage material employed. The two beams have a fixed frequency offset, and one is temporally encoded with data. The new method averts several of the drawbacks of existing approaches to time- and frequency-domain optical memories.
Swept-carrier time-domain optical memory [Opt. Lett. 17, 535 (1992)] has been proposed as a means of storing optical data streams in inhomogeneously broadened spectral recording materials. The process provides for full utilization of the material storage bandwidth regardless of the data rate and permits storage of data sequences with durations exceeding the material dephasing time. We report what we believe is the first experimental demonstration of this storage process. Our experiments, implemented with frequency-swept diode lasers and Tm(3+):YAG storage material, demonstrate single-event storage of 98-bit data streams whose duration is an order of magnitude longer than the material dephasing time.
Frequency-selective optical data storage (FSDS) provides for the heavy multiplexing of data at single spatial storage locations. The time-domain approach to FSDS offers in addition the possibility of extremely high data input/output rates. Nevertheless, a variety of technical problems must be resolved before the widespread implementation of FSDS memories becomes feasible. In the case of time-domain FSDS, for example, one must detect signal beams despite the presence of relatively strong memory readout beams in close temporal and spatial proximity. We demonstrate that this difficulty can be turned into an advantage in the case of the newly introduced swept-carrier approach to FSDS.1
The diffraction-limited spot size of a focused laser beam puts an upper boundary on the storage densities in conventional optical data storage. This can be overcome by storing multiple bits of data in each spatial location. In materials with an inhomogeneously broadened absorption line, such as crystals doped with rare-earth ions, frequency can be used as an additional addressing dimension. In some materials the number of spectral channels can be as high as 107. Spectral data storage can be done using coherent transient interactions between light and atoms and can be described in terms of photon echo processes. In this Master's Project the swept-carrier time-domain (SCTD) approach, a hybrid between frequency- and time-domain approaches, is used. An overview of the theory is given, followed by a description ofthe set-up and equipment. A maximum of 330 bits of data have been stored in one spatial location. The necessary conditions for successful storage and retrieval of data have been examined and suggestions are given on how to extend the results further.